Filing device for scraper-blades.



J. MIOTKE. FILING DEVICE PoR SGRAPER BLADES.

APPLICATION FILED DEO. 7. 1908.

f Patented Mar. 15, 1910.

2 SHEETS-SHEET 1.

Witnesses Mmiw E. GRAHAM C0. FNuw-LlwccnAPuERs,WASHWUQN. D c.

J. MIOTKE. FILING DEVICE PoR SCRAPEE BLADES. APPLICATION FILED DEC. 7.1908.

2 SHEETS-SHEET z.

Patented Mar. 15, 1910.

JOSEPH MIOTKE, OF MILWAUKEE, WISCONSIN.

FILING DEVICE FOR SCRAPER-BLADES.

Specification of Letters Patent.

Original application led .T une 29, 1907', Serial No. 381,558. Dividedand this application filed December To all whom it may concern:

Be it known that I, JosErH Mio'rxn, of Milwaukee, I/Visconsin, haveinvented a Filing Device for Scraper-Blades, of which the following is aspecication.

The ordinary floor-scraper as at present in use, has, as is wellunderstood, a blade whose cutting edge is directed at an angle,ordinarily a right angle, to the plane of the blade itself; in otherwords, it has what is known -as a turned edge. rIhe sharpened edge ofthe scraper, which is turned at an angle to the plane of the blade, isonly a minute fraction of an inch in width, and therefore cannot beformed once for all upon the blade, since it soon becomes worn off inuse and requires to be re-formed; and for this purpose it is necessaryto lirst sharpen or edge the blade in the original plane thereof, andthen to turn said sharpened edge, without dulling the same, to therequisite angle. Practice has shown that this is a most ditlicultoperation, requiring the utmost skill in order to get a perfectly smoothand evenly directed edge without chipping off little pieces, or dullingit; and that to form this edge with the ordinary tools is entirelybeyond the skill of the ordinary workman employed to use the scraper.Now as the scraper-blade requires frequent resharpening and as theScrapers themselves are frequently, or rather to say generally, used farfrom any machine-shop, perhaps hundreds of miles from a place whereskilled workmen could be procured to sharpen the blades, it does notavoid the difficulty to provide the Worker with an extra supply ofblades, and as the workmans own skill is almost invariablyinsuliicientto form a proper edge upon the blade which will enablesatisfactory work to be done, this has amounted in a majority ofinstances hitherto to a practical prohibition of the use of the scraperaltogether inplaning and smoothing floors after being laid.

It is the object of this invention, taken in connection with thesharpening and setting device which forms the subject of my copendingapplication No. 381,558, filed June 29, 1907, of which this applicationis a division, to overcome these diiiiculties by providing an apparatusby which scraper-blades at all times can be sharpened by any one,without any expert skill or knowledge of the Subj ect, and thus bringthe sharpening proc- Serial N0. 466,203.

ess within the reach of the average workman; thereby in turn extendingthe use of the wheeled floor-scraper (a device of very recent origin)over a field of use many times as large as at present.

I further aim to provide such a device as will enable scraping-blades tobe sharpened not only by unskilled labor, but also in a period of time(amounting to 1 or 5 minutes) insignificant in comparison with thatwhich is required when they are sharpened as usual heretofore, thussaving a vast amount of time to the workman employed, since these bladesrequire very frequent sharpening in order to do good work. And I furtheraim to produce such a device as will, besides accomplishing the objecthereinabove mentioned, enable an edge far more perfect and smooth, sharpand regular, to be produced upon the scraper blades, than is possible incarrying out the ordinary method of sharpening.

The present invention is limited to the tiling or rough-sharpeningportion of the sharpening operation and consist-s generally speaking ofa frame made in two main parts, one of which is provided with a clampingdevice for holding blades during the ling or like sharpening operationand the other with a set of guides arranged to hold the tool in theproper position and permit it to move back and forth over the edge to besharpened.

For the better understanding of my invention I have illustrated the samein concrete form in the accompanying drawings wherein,

Figure 1 is a front view of one form of my device showing the file andholder in position for use and in section on the plane 1 of Fig. 2; Fig.2 is an end elevation thereof from the right of Fig. 1 illustrating thefiling operation; Fig. 3 is a longitudinal central section through thetile-guide or bridge and le-holder, the irile being shown in elevation;Fig. is a perspective view of the filing-slide or bridge; and Fig. 5 isa perspective View of the tile-holder.

In these drawings every reference letter and numeral refers always tothe same part.

The device as shown in the first form consists of a main frame-piece Ahaving a liat base-plate a at whose extremities are upright standards a2with a pair of clamping arms a3, which extend around the edge Y PatentedMar. 15, 191@ of a table or work-bench B on which the device is mountedand are adapted to clamp it firmly thereto by means of clampingscrews a*provided with abutment pieces a5 loosely mounted on their ends, saidclamping-screws being screwed up firmly to the under side of the tableor bench B. Tnstead of the clamping-arms or screws, any other suitablemeans may be substituted for at-tachiner the member A permanently orremovably to the table or bench B and is consistent with my invention.

The standards a2 are provided with screw bosses as receivingpivot-screws al, whose ends as are reduced to form bearings for the hubsc of the rotatable member C which is pivoted upon said screws. Saidmember C has an oblique upper surface to which is clamped thescraper-blade l) which is to be sharpened, by means of a clamping-plateE and cap screws c, provided with washers e2 and passing through holesin the plate E and engaging threaded sockets in the member C as clearlyshown in Fig. l. The screws c do not pass through holes in thescraper-blade D but through slots d which are generally provided in suchblades for setting them in the scraper to permitof the blade beingadjusted to take up wear. This enables the blade to be likewise movedforward in the holder as it becomes worn down by frequent resharpening.To enable it to be set rapidly and correctly to project the properamount, I may provide a pair of adjusting screws c2 provided with milledheads c3 and turning in threaded lugs c* on the holder C.

The standards a of the member A are provided at their upper corners withprojecting lugs a" to which are secured a pair of longitudinal curvedguide-bars ctw by means of screws c or in any other suitable fashion.The guide-bars are parallel and connect the two standards at the frontand back, and they are made curved to fit the proper curvature of theworking-edge of the scraper-blades.

The member C is made pivoted with respect to member A for purposes notconnected with the filing-means which form the subject of thisapplication, and the purpose thereof and of the circular arc am, notchescl3, and pins c5 coperating therewith, is not essential to the filingmeans and is described in connection with my aforesaid application ofwhich this is a division. So far as the filing means is concerned, themember C may be made stationary.

In connection with the device as above described, there is used asliding-bridge F which is used as a guide for the iile in the importantoperation of beveling the edge of the blade in the initial operation ofsharpening. This member is shown in perspective in Fig. 4;. It has apair of sideflanges f which are properly spaced to lit on the outersides of the guide-rails al, and rectangular projections f2 in thecorner form seats or rests which abut on the upper faces of the railsand slide thereon. The sideflanges f are connected by cross-flanges f3,the distance apart of which corresponds with the spacing of the rails gof the fileholder G, which is shown separately in perspective in Fig. 5.It is to be understood that the inner faces of the iianges f3 areproperly spaced to receive the bars g between them without anyunnecessary lateral motion or wabbling, and in this position the bars grest upon four raised rectangular projections f* at the corners of themember F, while between these projections the flanges f are cut away asshown at f5 to leave room for the file H, as will be best understood byconsidering Fig. 1, which shows an end-view of the slidingbridge and across-section of the le and file-holder in position therein. The latterconsists of a pair of transverse end-blocks g2 united by the bars g',and slotted out at g3 to receive the file H, which passes therethroughand is clamped in place by setscrews (f1. It will be observed that thelower faces of the slots g are below the bars g' so that the active faceof the iile passes below said rods and the latter in consequence nevercome in contact with the edge of the scraper blade.

The operation of sharpening the blade is as follows: The blade being setup in the holder C and suitably adjusted therein by means of the screwsc2, the slide-bridge F placed upon the rails (No, and the tile H fittedin the tile-holder Gr, the operator then places the file and holderbetween the longitudinal flanges f3 of the bridge and reciprocates thefile longitudinally in the ordinary manner of tiling, moving it slowlyalong the edge until the blade is filed down substantially t0 the pointwhere the file is moved without further action thereon. Then the edge issmoothed by a draw-filing operation, the file and bridge being movedalong the rails L10 without moving the file in the bridge. This servesto give greater smoothness to the tiled edge. After this the blade maybe further smoothed by means 0f an ordinary oil-stone, one edge of whichmay rest on the rail d10 while the other rests on the blade, using it inthe same manner as in tiling, and the blade is then ready for thesetting and turning operation, which is described in my aforesaidcopending application.

lVhile T have hereinabove shown the most improved form Of my invention,T wish it understood that not all of the features are essential theretoor necessarily made in the eXact form shown, but various changes andmodifications in the constructions as herein shown may be made Withoutdeparting from the spirit of my invention, and I Wish it understoodtherefore that the latter is not otherwise limited than by thereasonable scope of my claims.

Having lthus described my invention, What I claim as new and desire tosecure by Letters Patent is:

l. A device of the class described comprising, in combination, means forholding a scraper-blade in a relatively fixed position, one or moreguides parallel to said blade, a sliding-member engaging said guide orguides and acting itself as a guide for a tool moving over the edge ofsaid blade, and a tool-holder engaging said sliding-member and having asliding movement thereon transverse to said blade.

2. A device of the class described comprising, in combination, ablade-holder, and a pair of parallel guide-bars on opposite sidesthereof and adapted to guide a tool in contact with the edge of a bladeheld by said holder, said holder and bars bein@ fixed as regardsrelative longitudinal movement.

3. A device of the class described comprising, in combination, ablade-holder, and a pair of parallel guide-bars on opposite sidesthereof and adapted to guide a tool in contact with the edge of a bladeheld by said holder, said guide-bar having a curved form correspondingto the curved edge of the blade to be sharpened.

a. A device of the class described comprising, in combination, abladeholder adapted to hold a scraper-blade, a pair of parallelguide-bars on either side thereof, and a sliding-bridge adapted to slidelongitudinally on and guided by said bars, said bridge forming a restfor a tool adapted to operate on the edge of the blade held in saidholder.

5. A device of the class described comprising, in combination, ablade-holder adapted to hold a scraper-blade, a pair of parallelguide-bars on either side thereof, a sliding-bridge adapted to slidelongitudinally on and guided by said bars, said bridge being open in thecenter and forming a rest for a tool placed thereon and contacting Withsaid scraper-blade in the central opening of said bridge.

o. A device of the class described comprising, in combination, abladeholder adapted to hold a scraper-blade, a pair of guide-bars oneither side thereof, a slidingbridge resting on said guide-bars andsliding longitudinally thereon and a tool-holder adapted to hold a toolin position to operate on the edge of a scraper-blade held by saidblade-holder, said tool-holder resting on and being guided by saidsliding bridge and having a transverse sliding motion relative to theedge of said blade.

7. A device of the class described comprising, in combination, abladeholder, means for guiding a sliding-member along the edge of ablade held in said holder, a sliding member engaging said guiding means,said sliding member having Ways for guiding a tool-holder in a movementtransverse to said blade; and a tool-holder comprising a pair oflongitudinal bars united by transverse-blocks at the ends, said barsbeing adapted to slide in the Ways of said sliding-member, said blockshaving apertures for receiving a tool such as a Eile and means forclamping it therein, the surface of said tool when so positioned lyingbelow said bars and thereby contacting with the edge of the blade Whilesaid bars are out of contact therewith.

In Witness whereof I have hereunto set my hand this fourth day ofDecember, 1908.

JOSEPH MIOTKE.

IVitnesses:

GEORGE WV. CoLLEs, EMIL WALLBER.

